Paper-maker&#39;s felt



'" in the fabric,

Patented June 12, 1923.

" l ldd dl car" srrs res EDMUND N. HUYCK, 0F ALBANY, NEW YORK, ASSIGNORTO F. C. HUYCK &. SONS, OF

ALBANY, NEW YORK, A CORPORATION.

PAPER-MAKER S FELT.

No Drawing.

To all whom it may concern Be it known that I, EDMUND N. HrrYoK, acitizen of the United States of America, residing at Albany, in thecounty of Albany and State of New York, have invented certain new anduseful Improvements in Paper-Makers Felts, of Which the following is aspecification.

My invention relates to papermakers felts.

Since endless felts were first used in papermaking machines it has beennecessary to have a guide line or stripe on the felts in order that theoperator might be able to see whether or not they were running true.

Papermakers felts are woven with warp and weft yarns which cross atsubstantially right angles. After the fabric has been woven it receivesa heavy fulling or felting in which process they are shrunk to very muchless than their original size. Should the felt not run true, therelative positions of the yarns change so that the weft yarns no longercross the warp yarns at substantially right angles, and this change inthe relative positions of the warp and Weft yarns will reduce theporosity of the fabric at the point or points therein where it haspulled out of true. It is in order to guard against this reduction inporosity at points that it is necessary to have a guide line or stripeby which the operator may judge whether or not the felt is running truein the paper machine.

When endless felts were first used in papermaking machines they traveledat a comparativel low speed and it Was found that a single colored yarn,woven into and across the fabric, formed a satisfactory guide line orstripe. As the machines were improved the speed was increased, and itwas found necessary to increase the width of the guide line in orderthat it might be readily observed by the operator as it passed at theincreased speed, and enable him to judge Whether or not the felt wasrunning true in the machine. This widening of the guide line or stripewas accomplished by increasing the number of colored yarns which formedthe line or stripe.

On the more modern papermaking machines, in which the felts are run at aspeed many times as great as in the pioneer machines, it is desirablethat the guide line or Application filed September 12, 1921. Serial No.500,182.

stripe be many times as wide as those first used; in practice it hasbeen found that a stripe having a width of about two inches will provesatisfactory as a guideline for any size of paper makers felt.

To produce the required guide lines or stripes in paper makers felts, itis the present practice to weave into the fabric the necessary number ofcolored yarns which have been dyed in the skein; and great care isexercised to insure that the colored yarns are the same as the uncoloredyarns which are used to form the rest of the fabric, and that in thedyeing process their nature is changed as little as possible.

Notwithstanding the great care taken in the dyeing of the yarns used toform the stripe, it is found that in felts for modern machines in whicha comparatively wide stripe is necessary, the part of the fabric inwhich such stripe is formed does not full or felt to exactly the samedegree as the other parts; and the result is a difference in the degreeof porosity of the stripe portion and the remainder of the fabric, andthere sometimes results a difference in the thickness of the colored anduncolored portions of the finished fabric. It is also found that in manycases there is a difference in the wearing quality of the colored anduncolored yarns.

Then all parts of the felt are not substantially uniform the product ofthe paper making machine on which it is used will be imperfect; and ifthere is an appreciable difference between the stripe portion of thefelt and the remainder thereof it may cause breaks in the sheet.

The object of my present invention is to produce improved paper makersfelts which will have the required sharply defined and comparativelywide guide line or lines or stripes and which will be 'of uniformstrength and texture throughout.

1 accomplish my object by weaving the endless fabricin the usual mannerbut without weaving in difi'erently colored yarns; after the fabric hasbeen woven it is fulled or felted to the desired degree. After thefulling or felting of the fabric has been completed, 1 form thereon andacross the fabric a stripe or colored portion of any desired width byapplying to said fulled or felted fabric a suitable coloring matter,which may be a coal tar product form a stripe across the fabric after ithas been fulled or felted and Without causing any appreciable differencebetween such striped portion and the balance of the fabric, may be usedWithout departing from the spirit of this invention, I do'not Wish tolimit myself to any particular dye.

When the stripe is applied or made on the fabric after the feltingprocess-is completed by the application thereto of one of the abovementioned dyes, or a suitable substitute therefor, it will be found thatthere is appreciable difference between the striped portion of thefabric and the remainder thereof, either as to thetdegree of porosity,thickness, or Wearing quality; 1 1m 7 i. 11 1. Endless papermakers"felts having a guide line formed thereon. by the application of asuitable dye. after the completion of the fulling or feltingthereof.

2.,Endless papermakers felts having a guideline formed thereon after thecompletion of'the fullingor felting thereof, by'the application of a dyewhich Will have no appreciable effect upon said felt other than to colorthe portion thereof to Which it is applied.

In testimony signature.

, EDMUND N. HUYCK.

whereof I have affixed my

